new sections for tliT'^e ,5enera- ITucula, Ler"'a and Area . 



Among the prionodontG the Peetenc are subordiiiate only to 

 the Areas. They contribute 1.3 uoeeies, representinp- ..eyen 

 see tion§, among which are inclucled virtually all the groups 

 that would he expected in a tropical feu ,a. The Aeg.iipecteriS 

 are the most prolific and include severe:! .^.eciuG that are 

 widely distributed in the AntilleSn region. V/ith regard to 

 specific diversificatiDn Ghlany s c. s. is almost equal to 

 Aequipeoten , but o^ii^- one of the species is abundant. Jne of 

 the interesting features presented by the Pectens is the occur-; 

 rence of numerous valves of a STne.ll, delic:;tc Pseudamusiurn and 

 also a single valve of a Propeaniuuiuni , la'-ter being rather 



rare in the fossil state. 



The oysters form a puzzlin'^ asrenblape, for they are 

 few in number in all the collectio-is available ax^o large ior:;is are 

 notably absent. T> e small siz- eworthy when it is consid- 



ered that especially in the Santo Domiri>-'lan fauna and also in 

 the Alum 'Bluff faunas a uoeoie;; that is considered identical vn. th 

 one of the Bowden f orm-s reaches an imposinp- size. Since the 

 same condition obtains in all the collections it may probably 

 be asrumed that the indicated relative importance of the genus 

 is approximately correct, a] h it must Idc remerabere' that 



subseouent e-oloration may reveal the presence of lar-e o:-;..ter 

 beds, in cop-neotion with the STiiall size of the oysters it is 

 interesting to note that an xinsually larp-e and oonderous Santo 



